- remove problems with class hierarchy

.../rosi_project/model_sync/generator/acr_model/SClass.scala

.../rosi_project/model_sync/generator/acr_model/SModel.scala

...g/rosi_project/model_sync/generator/acr_model/SType.scala

...project/model_sync/generator/acr_model/SimpleSModel.scala

...ect/model_sync/generator/conversion/SClassConverter.scala

...ect/model_sync/generator/conversion/SModelGenerator.scala

...g/rosi_project/model_sync/generator/io/SClassWriter.scala

...ject/model_sync/generator/sync/SyncEnhancingVisitor.scala

..._project/model_sync/generator/test/SClassWriterTest.scala

...roject/model_sync/generator/test/SModelFSWriterTest.scala